hodgman



(No Model.)

'B. HUBER 5w. K. HODGMAN.

PRINTING PRESS.

No. 544,809. Patented Aug. 20, 1895.

UNITED STAT-Es PATENT ()FFICE.

BERTHOLD HUBER AND WILLIS K. HODGMAN, OF TAUNTON, MASSACHUSETTS,ASSIGNORS TO THE HUBER PRINTING PRESS COMPANY, OF SAME PLACE.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No, 544,809, dated August20, 1895. Application filed January 14,1895; Serial No. 534,772. (Noinodel.)

To aZZ whom it may concern.- 1

Beit known that We,-BERTHOLD HUBER and WILLIS K. HODGMAN, of Taunton,county of Bristol, State of Massachusetts, have invented 5 anImprovement in Printing-Presses, of which the following description, inconnection with the accompanying drawings, is a specification, likeletters on the drawings representing like parts. to

revolution printing -presses, so called, in which theimpression-cylinder is continuously rotated and makes two revolutionswhile the reciprocating bed or form carrier makes one I 5 completestroke, the impression-cylinder and form being slightly separated duringthe return of the latter. In such presses it is most essential to theproduction of good work that the registering shall be accuratethat is,difzo ferent parts of the form must arrive opposite the same points onthe cylinder at each impression-and we have attained such accuracy ofregister, especially at the points where the printing'begins and ends,by positively moving the cylinder and bed or form-carrier in unison atsuch points or adjacent thereto.

In accordance therewith our invention consists, in a two-revolutionprinting-press, of a rotatable impression-cylinder, circumferen- 3otially-separated toothed segments thereon laterally'offset one from theother, a reciprocat ing form carrier, longitudinally separated racksthereon adjacent the head and tail of the form and respectively locatedin the paths 3 5 of the said segments, the racks and their cooperatingsegments being so located relatively to the center of the stroke thateither segment will, in the back stroke of the formcarrier, move througha toothless space trans- 0 versely adjacent to the rack lying in thepath of the other segment, substantially as will be described.

Other features of ourinvention will be hereinafter described, andparticularly pointed 5 out in the claims.

Figure 1, inside elevation and partly broken out, represents asufticientportion of a tworevolution printing-press to be understoodwith our invention applied thereto, with the parts in the center of theprinting-stroke.

Fig. 2 is a detail view in elevation of the cyl- This invention relatesto the class of two rocating the bed a are and may be substaninder andbed or form-carrier slightlyseparated and in the center of the backwardor non-printing stroke; and Fig. 3 is a plan view,

broken away, of the bed and form, showing one arrangement of theregister-racks thereon. The frame A, of suitable shape to providebearings for the operating parts, the impression-cylinder a, journaledin standards a, resting at their lower ends upon the eccentric portionsa of a rock-shaft a suitably operated to keep the cylinder in contactwith the form a supported by the bed or carrier a during the forwardstroke of the bed and to raise the cylinder from contact with the formduring the return or backward stroke of the bed; the gear d, in meshwith and driving the gear d on the cylinder-shaft d and the mechanismfor rotating the geard and recip- 7o tially as shown in United StatesPatent No. 417,826, dated December 24, 188.9,and form no part of thisinvention. a

The bed a is provided with a bearing a, upon which runs thecylinder-bearing a during the printing-stroke of the press. A bar 0 isherein shown as secured to one side of the bed 06 by suitable set-screws0', extended through longitudinal slots 0 in the bar into the bed, thebar having rack-teeth 0 formed thereon at its upper edge adjacent thehead of the form a and a second series of rackteeth 0 adjacent the tailof the form, ofiset one from the other, to travel in separate parallelpaths during the reciprocation of the bed. The rack c is considerablylonger than the rack 0 and the two are separated longitudinally by ablank space 0 A toothed segment d is secured to the impression-cylinderer in the same vertical plane as and to at times mesh with the rack c onthe bed, and a second toothed and longer segment d is secured to thesaid cylinder in the vertical plane of and to at times mesh with therack 0 the segments being circumferentially separated and so located asto mesh with their co-operating racks at the beginning and ending of theprinting, whereby the cylinder and bed will be positively moved inunison at such times. By this means an accurate register is attained,and it is impossible for one or the other to slip as theform begins oris finishing the printing, the points where inaccuracy is otherwise mostlikely to occur.

In Fig. 1 the segment and rack d and a have just become disengaged, thebed moving in the direction of the arrow, and the segment 01 and rack care just. about to engage to remain in mesh during the remainder of theprinting, the cylinder and bed being thus locked together during theforward stroke for the whole length of the form, except at the center ofthe'stroke, where the bar 0 is cut away or plain at c". As the cylindera continues to revolve after the impression is made it is slightlylifted from the bed as the latter begins its backward stroke, and thesegment 01 sweeps around outside of the rack 19 in a toothless space, sothat there is no possibility of engagement therewith, and obviating theshortening of the teeth of either.

In Fig. 2 the bed is at the center of its backward stroke, and duringthe remainder of the stroke in the direction of the arm the segment tionc7 of the bar 0 and-inside of the path of movement of the rack 0 By thisarrangement of offsetting the racks and segments to move in differentpaths a very slight separation of the impression-cylinder and the formduring the non-printing stroke of the bed is sufficient. At the end ofthe second revolution of the cylinder the segment 01 is in position toengage its rack c for the next impression. The bars 0 are longitudinallyadjustable on the bed by means of the slots 0 and the set-screws c, asmay be necessary.

Our invention is not restricted to the form of press herein shown, as itmay be applied to any two-revolution bed and cylinder printingpress, andinstead of making the racks upon a single bar each rack may beseparately attached to the bed without departing from the spirit andscope of our invention. The relative lengths of the racks andco-operatingsegments may be altered so long as the engagement one withthe other locks the cylinder and bed at the beginning and ending of theprinting.

It will be obvious that the end of the printing need not necessarilyoccur'at the end of I the form, for the length of the matter to beprinted will vary according to circumstances, and the length of the backsegment and rack is sufficient to permit such variation in the positionof the end of the printing as will occur in practice.

Each rack is extended toward and as near directions past theclearance-points, and were it not for the proper location of thesepoints the teeth would engage and be stripped.

The inner end of a rack moves away from its clearance-point as theco-operating end of its segment reaches it, or vice versa, as shown inFig. 2, in, the back stroke of the form-carrier.

We claim- 1. In a two-revolution printing press, a rotatable impressioncylinder, circumferentially separated toothed segments thereon laterallyoffset one from the other, a reciprocating form-carrier, longitudinallyseparated j racks thereon adjacent the head and tail of d on thecylinder passes over the plain por-q of the said segments, the racks andtheir 00* 1 operating segments being so located relatively lto thecenter of the stroke that either seg ment will, in the back stroke ofthe formcarthe form and respectively located in the paths rier, movethrough a toothless space trans versely adjacent to the rack lying inthe path of the other segment, substantially as de scribed.

2. In a two-revolution printing-press, a ro-* j tatable impressioncylinder, a co-operating reciprocating form-carrier, separated racks onsaid carrier located in different parallel vertical planes adjacent thehead and tail of the former and extended therefrom toward the center ofthe stroke to the clearance point, and circumferentially separatedsegments on the cylinder and respectively located in the paths ofmovement of said racks, to co-operate therewith singly in the forwardstroke at the beginning and ending of the printing, the inner end of arack moving away from the clearance point as the co-operating end of itssegment reaches it, or vice versa, in the back stroke of theform-carrier, substantially as described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

BERT-HOLD HUBER. WILLIS K. HODGMAN. Witnesses:

EDWARD P. COLEMAN, FREDK. M. A'IWOOD.

ISO

